they needed to speak with dooley again, so he went to the apartment he shared with his wife, janet, andhem. before detective mcvay even brought it up, dooley told him he had gone home the morning of the murder. mcvay recorded the conversation. >> i came back here. i get a hold of my wife and what came home to make sure she was okay. >> yesterday you didn't tell me you left. >> i didn't think about that. >> detective stahl also questioned david's wife, janet, separately to see if she would tell the same story. this conversation would prove critical to the entire case. what she said is in dispute because a part of the recording is hard to hear. >> was the first time you saw dave after he left? >> he came home. >> yeah. >> asked her specifically if dave ever came home that morning , and she says no. >> to detective stahl and detective mcvay, janet dooley had just contradicted her husband story, so please questioned her again about that trent -- apparent discrepancy. >> you told the other detective that he didn't come home that day. >> i did? >> janet seemed surprised. she told police that